Despite the rather unpleasant wet spring snow, this weekend is Doors OpenDenver. This is a great opportunity to get to tour many of Denver's most interesting buildings that are otherwise not open to the public. Doors Open Denver The list of buildings open for tours is quite long, but here are few good highlights:
clocktower1
Clocktower, downtown
university-club
University Club
zang-mansion1
Zang Mansion
phipps-tennis-pavilion
Tennis Pavilion at the Phipps Conference Center
Union Station is the central terminal for all this activity, both Saturday and Sunday. They will have maps and help with both self-guided and architect-guided tours.